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A.28 REGIONAL AQUIFER-SYSTEM ANALYSIS—CENTRAL VALLEY, CALIFORNIA <br /> 123` 122` 121` 120° 119` i18` <br /> 4i Red 8101 <br /> EXPLANATION <br /> 40` fN CHANGE IN H1'DRAt'LIC HEAD,IN FEET <br /> Rise of 0 to 10 <br /> Decline from 0 to 40 <br /> Ito <br /> 'fE.c Decline From. 40 to 80 <br /> Decline from 80 to 120 <br /> 39` <br /> Decline From 120 to 200 <br /> 0 <br /> SacramenSo ® Decline from 200 to 300 <br /> O R <br /> ® Decline from 300 to 400 <br /> a .nn ; Decline of more than 4[>t1 <br /> V <br /> r <br /> I.I.. <br /> Rllie�i&I <br /> boundary <br /> I I <br /> 37` <br /> F <br /> 0 50 100 MILES � ]� <br /> 4 50 100 KILOMETERS <br /> II <br /> 35° <br /> FIGURE 18.—Estimated change in hydraulic head in lower pumped none from 1860 to 1961(modified from WiWam8on and others, 1989). <br />